Cal. Bus. & Prof. Code § 4161.5

At such time as federal regulations are promulgated to implement Section 584 of the federal Food, Drug, and Cosmetic Act (21 U.S.C. Sec. 360eee-3), the board shall immediately identify any standard, requirement, or regulation in California law governing interstate commerce that is in conflict with the federal regulations and act to remove the conflict in the manner permitted by law.